diff --git a/src/main/java/pw/kaboom/extras/modules/server/ServerCommand.java b/src/main/java/pw/kaboom/extras/modules/server/ServerCommand.java
index 9b1e08c..b77eed4 100644
--- a/src/main/java/pw/kaboom/extras/modules/server/ServerCommand.java
+++ b/src/main/java/pw/kaboom/extras/modules/server/ServerCommand.java
@@ -38,6 +38,19 @@ public final class ServerCommand implements Listener {
         return false;
     }
 
+    public static boolean checkValidUTF8(final String component) {
+        int len = component.length();
+
+        for (int i = 0; i < component.length(); i++) {
+            int c = component.charAt(i);
+            if (c == 0 || c >= 128) {
+                len += c >= 2048 ? 2 : 1;
+            }
+        }
+
+        return len <= 65535;
+    }
+
     private static String checkSelectors(final String[] arr) {
         final String[] args = Arrays.copyOfRange(arr, 1, arr.length);
         final String str = String.join(" ", args);
@@ -77,6 +90,8 @@ public final class ServerCommand implements Listener {
             commandName = "/" + arr[1].toLowerCase();
         }
 
+        if (!checkValidUTF8(command)) return "cancel";
+
         try {
             switch (commandName) {
                 case "/minecraft:execute", "/execute" -> {